JPH1092282A - Relay operation detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relay operation detecting device which judges operation accurately responding to operation timing and return operation timing of an electromagnet coil and outputs a returning judge signal. SOLUTION: A relay operation detecting device detects voltage applied to an electromagnet coil 2 with a voltage detecting part 4, compares the applied voltage of the electromagnet coil detected with the voltage detecting part with the reference voltage in a reference voltage setting part 12 by a voltage comparing part 13, and when the applied voltage is increased to the operation voltage sucking a moving piece and when it is decreased to the operation voltage releasing the moving piece, operation detection and return detection are conducted. These signals are outputted with an output part 11, and a correct operation judging signal of the electromagnet coil 2 is outputted to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a relay operation detecting device.

[0002]

2. Description of the Related Art Conventionally, there has been widely used a relay for opening / closing a circuit by attracting / releasing a mover by exciting / demagnetizing an electromagnet coil and opening / closing or closing / opening a contact in conjunction therewith. Have been. It is necessary to check the operating characteristics of such a relay, and to extract the operating state of the relay as an electric signal and transmit it to a digital device,
Conventionally, a resistor and a photocoupler are connected in parallel to an electromagnet coil to directly monitor the voltage applied to the electromagnet coil, and when a rated voltage is applied, a detection signal is transmitted as a digital signal to an external digital device. Had taken the form.

In addition, a current for operation detection (a value equal to or more than the minimum energizing current of the contact) is applied to an empty contact of the relay (that is, a contact not used for switching the circuit) and the digital device processes the current value. There is a method in which the voltage is reduced to a possible voltage, the analog signal is digitized and transmitted to an external digital device to detect the operation state of the relay.

[0004]

However, in the former conventional relay operation detecting device, the resistance value is calculated by taking into account the resistance value of the resistor, the rating of the photocoupler, and the resistance value of the electromagnet coil. There has been a problem that it takes time and effort to install it because it has to be decided. Also, in order to connect the resistor and the photocoupler parallel to the electromagnet coil outside the relay, it is necessary to secure the installation space for those circuit elements, especially for circuits with a high integration density of circuit elements. There were also difficulties in searching.

Further, the operation of the relay indicates that the operation of the contact has been completed. By detecting the operation only by the voltage applied to the electromagnet coil, the characteristics of the electromagnet coil (showing hysteresis characteristics) and the operation of the relay are shown. The operation is detected irrespective of the operation, and there is a time difference from the actual operation of the relay, so that there is a problem that accurate operation detection cannot be performed. Looking at this point in the timing chart of FIG. 5, when the voltage applied to the electromagnet coil reaches a certain operating voltage Vat as shown in FIG. 5A, the movable element is attracted and the contact is opened (normally open). (In the case of a contact) / close operation (in the case of a normally closed contact), but as shown in FIG.
There is a 1 and after this time difference T1, the contact opens / closes the circuit. Similarly, when the voltage applied to the electromagnet coil drops to a certain return voltage Vrt, the mover is released from the attracted state and the contact is closed (in the case of a normally open contact) / opened (in the case of a normally closed contact). However, in this case as well, a time difference T2 occurs before the contact actually closes / opens. In contrast, the conventional relay operation detection device outputs an operation detection signal when the applied voltage of the electromagnet coil reaches a certain rated voltage Vrf exceeding the operating voltage Vat, and the applied voltage drops from the rated voltage Vrf. Since the return operation detection signal is sometimes output, a time difference between t1 and t2 has occurred between each operation and the actual operation of the contactor.

In the latter conventional relay operation detecting device, it cannot be used without an empty contact.
There was a problem that the use was restricted. In addition, the minimum energizing current is set for the contact, and operation detection cannot be performed accurately with a small current less than that current.Conversely, if a current of the contact applicable current value is applied, the current value of digital equipment usually becomes large. In other words, it is necessary to step down the current before inputting to the digital device. In addition, the signal must be digitized in order to be processed by the digital device, and additional circuits are required. And the configuration becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and has a built-in relay to detect an operating voltage and a return voltage of an electromagnet coil in accordance with the operating characteristics of the electromagnet coil and operate the detection signal. An object of the present invention is to provide a relay operation detection device that can be taken out as a detection signal to the outside.

[0008]

According to a first aspect of the present invention, there is provided a relay operation detecting apparatus comprising: an electromagnet coil; a movable element attracted by a magnetic field of the electromagnet coil; and a contact that opens and closes in conjunction with the operation of the movable element. A relay having the same, a voltage detecting unit installed in the housing of the relay and detecting a voltage applied to the electromagnet coil, and a suction operation and a releasing operation of the mover, which are installed in the housing of the relay. A reference voltage setting unit for setting a reference voltage, and a comparison is made between the applied voltage of the electromagnet coil detected in the voltage detection unit and the reference voltage set in the reference voltage setting unit, which is installed in the housing of the relay. A voltage comparison unit, and an output unit that is installed in the housing of the relay and outputs a comparison result of the voltage comparison unit.

In the relay operation detecting device according to the first aspect of the present invention, the voltage applied to the electromagnet coil is detected by the voltage detecting section, and the voltage applied to the electromagnet coil detected by the voltage detecting section is detected by the voltage comparing section. Compared with the reference voltage set by the voltage setting unit, when the operating voltage for attracting the mover has been reached, and when the operating voltage has dropped to the operating voltage for releasing the mover, operation detection and return detection are performed. Is output to the outside by the output unit. Therefore,
The operation voltage and the recovery voltage of the electromagnet coil are detected, and the operation detection signal and the recovery detection signal can be output to the outside, respectively, so that accurate operation determination can be performed.

According to a second aspect of the present invention, there is provided a relay operation detecting device.
A relay having an electromagnet coil, a mover attracted by the magnetic field of the electromagnet coil, and a contact that opens and closes in conjunction with the operation of the mover; and a voltage applied to the electromagnet coil, which is installed in a housing of the relay. And a reference voltage setting unit that is installed in the housing of the relay, sets a reference operating voltage of the mover, and is installed in the housing of the relay, and is detected by the voltage detection unit. An operation determining unit that compares the applied voltage of the electromagnet coil with a reference voltage set in the reference voltage setting unit and determines an operation when the voltage rises by a certain voltage exceeding the reference voltage, and installed in a housing of the relay. When the applied voltage of the electromagnet coil detected by the voltage detection unit is compared with the reference voltage set in the reference voltage setting unit, when the reference voltage is cut and the voltage drops by a certain amount. A return operation of determining the return operation determination unit is installed in a housing of the relay, the operation determination unit,
And an output unit for outputting a determination result of each return operation determination unit.

In the relay operation detecting device according to the second aspect of the present invention, the voltage applied to the electromagnet coil is detected by the voltage detecting section, and the voltage applied to the electromagnet coil detected by the voltage detecting section is detected by the operation determining section. The voltage applied to the electromagnet coil is compared with the reference voltage set by the voltage setting unit, and the operation is determined when the applied voltage of the electromagnet coil exceeds the reference voltage and rises by a certain voltage. When the voltage applied to the electromagnet coil falls below the reference voltage and drops by a certain voltage, the return operation is determined. Then, these operation determination signals are output to the outside by the output unit. Therefore, the operation timing and the return timing of the electromagnet coil can be detected, and the operation determination signal and the return operation determination signal can be output to the outside, respectively, and accurate operation determination can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a circuit configuration of a first embodiment of the present invention. An electromagnet coil 2 constituting a relay in a relay housing 1 and a movable element (attraction / release operation by excitation / demagnetization of the relay 2). (Not shown), and a relay contact 3a (normally open contact) and a relay contact 3b (normally closed contact) that are turned on / off in conjunction with the operation of the mover. The number of relay contacts and the combination of normally open contacts and normally closed contacts are not particularly limited.

As a feature of the present invention, the relay housing 1
Voltage detector 4 for detecting the applied voltage of the electromagnet coil 2
An operation reference voltage setter 5a for setting a reference voltage corresponding to the operation applied voltage Vat of the electromagnet coil 2, a return reference voltage setter 5b for setting a return reference voltage corresponding to the return voltage Vrt of the electromagnet coil 2, and voltage detection. Voltage comparators 6a and 6b for comparing the detection voltage of the detector 4 with the operation reference voltage and the return reference voltage, respectively, and the voltage comparators 6a and 6b.
6b, an exclusive OR circuit 7 for performing an exclusive OR logical operation, a flip-flop 8 operated by an inverted output of the exclusive OR circuit 7, and an operation by an "H" / "L" signal of the flip-flop 8 Judgment and return judgment signal 9
As an “H” / “L” signal.
And an operation determination output unit 11 for outputting the data to the CPU.

Next, the operation of the relay operation detecting device having the above configuration will be described with reference to FIGS. When the input voltage is applied, the electromagnet coil 2 is excited,
When it rises to the operating voltage Vat, the relay contacts 3a, 3
b operates. In parallel with this operation, the voltage detector 4 monitoring the operating voltage outputs a detection signal of the voltage applied to the electromagnet coil 2 to the voltage comparators 6a and 6b.

In the voltage comparator 6a, the operation reference voltage setting unit 5
a, the operation reference voltage Vat and the detection voltage are compared. At the same time, the voltage comparator 6b compares the detection reference voltage with the restoration reference voltage Vrt set in the restoration reference voltage setting unit 5b. To the exclusive OR circuit 7.

As shown in FIG. 2A, when a voltage is applied to the electromagnet coil 2 and the voltage rises and rises until the voltage exceeds the operating voltage Vat, the voltage comparators 6a and 6b both output from the voltage comparator 6a. The “H” signal is output, whereby the inverted output of the exclusive OR circuit 7 becomes “H”, and the flip-flop 8 outputs the “H” signal to the operation determination output unit 11. Then, as shown in FIG. 9C, the gate voltage of the operation determination output unit 11 becomes “H”, and this operation determination unit 11
Indicates the operation determination signal (ON signal) to the external digital device 1
0 will be output.

Next, when the applied voltage is cut off from the excitation state of the electromagnet coil 2 and starts to decrease, the output of the voltage comparators 6a and 6b is reduced to τ2 when the applied voltage decreases until the applied voltage drops below the return voltage Vrt. Both become "L", whereby the inverted output of the exclusive OR circuit 7 becomes "H" again, and the flip-flop 8 inverts the "H" signal up to that time and outputs the "L" signal to the operation determination output unit 11. I do. Therefore, as shown in FIG. 3C, the gate voltage of the operation determination output unit 11 becomes “L”, and the operation determination unit 11 outputs a return operation determination signal (off signal) to the external digital device 10. Become.

As described above, according to this embodiment, when the applied voltage of the electromagnet coil 2 rises beyond the operating voltage Vat at the rise, the operation is determined, and at the fall of the applied voltage, the return voltage Vrt is cut and dropped. Then, a return determination is performed, and an operation determination signal that exactly matches the operation of the electromagnet coil 2 and the timing of the return operation can be output to the outside.

Next, a second embodiment of the present invention will be described with reference to FIG. The relay operation detecting device according to the second embodiment receives a detection signal of the voltage detector 4 of the electromagnet coil 2, determines its rise and fall, and determines the reference voltage set in the reference voltage setter 12. Vcf is compared with the detection voltage, and when the voltage rises above the reference voltage Vcf by a constant voltage ΔV1 and thereafter, the “H” signal is continuously output to the gate of the operation determination output unit 11 and the voltage falls. From the time when the reference voltage Vcf is lowered by the constant voltage ΔV2, and thereafter, the “L” signal is output to the operation determination output unit 1.
It is characterized in that a voltage comparison / calculation unit 13 having a hysteresis characteristic which keeps outputting to one gate is built in the relay housing 1. The other components are denoted by the same reference numerals as those of the first embodiment shown in FIG.

Next, the operation of the second embodiment will be described with reference to FIG.
This will be described with reference to FIG. Vcf shown in FIG.
Is a reference voltage set in the reference voltage setting device 12. The reference voltage is not particularly limited, but is not limited to the operating voltage Va.
It is preferable for adjustment to set an intermediate value between t and the return voltage Vrt.

When the electromagnet coil 2 is excited by the application of the input voltage and rises to its operating voltage Vat, the relay contacts 3a and 3b operate after a time delay of T1. In parallel with this operation, the voltage detector 4 monitoring the operating voltage outputs a detection signal of the voltage applied to the electromagnet coil 2 to the voltage comparison operation unit 13.

In the voltage comparison operation section 13, the rise of the voltage,
The fall is determined, and the reference voltage Vcf set in the operation reference voltage setter 12 is compared with the detected voltage.

As shown in FIG. 4 (a), when a voltage is applied to the electromagnet coil 2 and the voltage rises and rises above the reference voltage Vcf to exceed ΔV1, τ1
In this case (the timing is set to be equal to the timing of reaching the operation voltage in the first embodiment), the voltage comparison operation unit 13 outputs an “H” signal to the operation determination output unit 11. Then, as shown in FIG. 3C, the gate voltage of the operation determination output unit 11 becomes “H”, and the operation determination unit 11 outputs an operation determination signal (ON signal) to the external digital device 10.

Next, when the applied voltage is cut off from the excited state of the electromagnet coil 2 and starts to decrease, when the applied voltage falls below the reference voltage Vcf and further decreases by ΔV2, τ2
(This timing is set to be equal to the timing of reaching the return voltage in the first embodiment.)
The voltage comparison operation unit 13 changes the output from the “H” signal to the “L” signal.
The signal is switched to a signal and output to the operation determination output unit 11. Then, as shown in FIG. 3C, the gate voltage of the operation determination output unit 11 becomes “L”, and the operation determination unit 11 outputs a return operation determination signal (off signal) to the external digital device 10.

Thus, according to the second embodiment, if the applied voltage of the electromagnet coil 2 rises to the operating voltage Vat which exceeds the operating reference voltage Vcf by ΔV1 at the rising edge, the operation is determined. Reference voltage V at falling
If cf falls to a return voltage Vrt reduced by ΔV2, a return determination is performed, and an accurate operation determination signal can be output to the outside.

[0026]

As described above, according to the first aspect of the present invention,
Detects the voltage applied to the electromagnet coil, compares it with the reference voltage, reaches the operating voltage for attracting the mover, and detects the operation when it decreases to the operating voltage for releasing the mover.
A function to detect return and output these judgment signals to the outside is built into the housing of the relay, so the operation voltage and return voltage of the electromagnet coil are detected and the operation detection signal and the return detection signal are output to the outside, respectively. It is possible to perform accurate operation judgment, and it is not necessary to separately connect external judgment elements, so that there is no need for labor and time for its installation and adjustment, and that these elements can be stored on an external circuit. It also has the advantage that no installation space is required.

According to the second aspect of the present invention, the voltage applied to the electromagnet coil is detected, compared with the reference voltage, the operation is determined when the voltage exceeds the reference voltage and rises by a certain voltage, and the voltage applied to the electromagnet coil is determined. Is compared with the reference voltage, when the reference voltage is cut off and the voltage drops by a certain voltage, a return operation judgment is made, and the function of outputting these judgment signals to the outside by the output unit is built in the relay housing, so the operation of the electromagnet coil It can detect the timing and the return timing and output the operation determination signal and the return operation determination signal to the outside, respectively, and can make accurate operation determination. It has the advantage that no labor and time is required for the adjustment, and that no installation space is required for these components on the external circuit.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram according to a first embodiment of the present invention.

FIG. 2 is an operation timing chart of the embodiment.

FIG. 3 is a circuit block diagram according to a second embodiment of the present invention.

FIG. 4 is an operation timing chart of the embodiment.

FIG. 5 is an operation timing chart of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Relay housing 2 Electromagnet coil 3a, 3b Relay contact 4 Voltage detector 5a Operation reference voltage setting device 5b Return reference voltage setting device 6a, 6b Voltage comparator 7 Exclusive OR circuit 8 Flip-flop 9 Judgment signal 10 Digital device 11 Operation Judgment unit 12 Reference voltage setting unit 13 Voltage comparison operation unit

Claims (2)

[Claims] 1. A relay having an electromagnet coil, a mover attracted by a magnetic field of the electromagnet coil, and a contact that opens and closes in conjunction with an operation of the mover; and the electromagnet coil installed in a housing of the relay. A voltage detection unit that detects a voltage applied to the relay; a reference voltage setting unit that is installed in the housing of the relay and sets an operation reference voltage for each of the suction operation and the release operation of the mover; and in the housing of the relay. A voltage comparison unit that compares the applied voltage of the electromagnet coil detected by the voltage detection unit with a reference voltage set in the reference voltage setting unit, and is installed in a housing of the relay, A relay operation detection device comprising: an output unit that outputs a comparison result of the voltage comparison unit. 2. A relay having an electromagnet coil, a mover attracted by a magnetic field of the electromagnet coil, and a contact that opens and closes in conjunction with the operation of the mover; and the electromagnet coil installed in a housing of the relay. A voltage detection unit that detects a voltage applied to the relay; a reference voltage setting unit that is installed in a housing of the relay, and sets an operation reference voltage of the mover; and a voltage detection unit that is installed in the housing of the relay. An operation determining unit that compares an applied voltage of the electromagnet coil detected by the unit with a reference voltage set in the reference voltage setting unit, and determines an operation when a constant voltage rises beyond the reference voltage; and The reference voltage set in the reference voltage setting unit is compared with the applied voltage of the electromagnet coil detected by the voltage detection unit, and cut off the reference voltage. A relay operation detection device comprising: a return operation determination unit that determines a return operation when a voltage drops; and an output unit that is installed in a housing of the relay and outputs a determination result of each of the operation determination unit and the return operation determination unit. .